README.md in fluent-plugin-elb-access-log-0.1.3 vs README.md in fluent-plugin-elb-access-log-0.1.4

- old
+ new

@@ -48,11 +48,13 @@
 ```javascript
 // elb.access_log:
 {
   "timestamp":"2015-05-24T08:25:36.229576Z",
   "elb":"hoge",
-  "client_port":"14.14.124.20:52232",
-  "backend_port":"10.0.199.184:80",
+  "client":"14.14.124.20",
+  "client_port":52232,
+  "backend":"10.0.199.184",
+  "backend_port":80,
   "request_processing_time":5.5e-05,
   "backend_processing_time":0.000893,
   "response_processing_time":5.7e-05,
   "elb_status_code":200,
   "backend_status_code":200,